Duplex steam-pump



(No Model.)

J. H. MOGOWAN.

DUPLEX STEAM PUMP.

No. 427,784. Patented May 13, 1890.

' flv/entor.

1 UNITED STATES ATENT rr rcn.

JOHN H. MOGOIVAN, OF CINCINNATI, OHIO.

DUPLEX STEAM-PUMP.

SPECIFICATION forming part of Letters Patent No. 427,784, dated May 18,1890. Application filed February 20, 1888- Serial No. 264,601. (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, JOHN II. MOGOWAN, a citizen of the United States,residing at Oincinnati, Hamilton county, State of Ohio, have inventednew and useful Improvements in Duplex Steam-Pumps, of which thefollowing is a specification.

My invention relates to valve-actuating mechanism for duplexsteam-pumps, having in view the triple object of simplifying theconstruction, operating the valves from a common fulcrum or center ofmovement, so as to obtain equal motions, and to move the valve-rods inhorizontal lines to avoid pivotal joints and undue wear upon thepackings.

A further object of my invention is to obtain, in connection with theseadvantages, a means of adjusting the motion of the valves in relation tothe steam-pistons, all as hereinafter more fully set forth.

Mechanism embodying my invention is illustrated in the accompanyingdrawings, in which Figure 1 is a perspective elevation of a duplexsteam-pump, showing the invention as applied in use. Fig. 2 is alongitudinal section of the duplex rocleshaft with its bearings in theline y of Fig. 1, and the valve link guides with a cross-section of therockshaft, showing the cam projections; Fig. 3, a detached side view ofone of the valve-rod links, showing the adjusting-collars upon thevalve-rod, and indicating the form of the slot in which the camprojection operates.

Referring now to the drawings, A A and B B designate, respectively, thesteam and pumping cylinders of a duplex steam-pump of the class in whicheach governing steamvalve is actuated through connections from thereciprocating piston of the opposite steamcylinder. The entireconstruction, excepting as to the valve-motion, is of the well-knowntype, and a detailed description is unnecessary.

The valve-motion is as follows: Concentric rock-shafts 1 2, operatingone within the other-that is, one being a sleeve upon the other-arecarried in acommon bearing upon a standard 3, erected upon the centralconnecting-brace 1 of the cylinders. The projecting ends of the shafts 1and 2, respectively, are provided with the ordinary depending lever-arms5 G, which engage in any suitable manner (not shown) with the respectivepiston-rods below. Thereciprocation of the piston-rods thus gives apartial rotation to and fro of the shafts 1 and 2, respectively. Eachshaft is provided with a cam-finger, respectively 7 and 8, the formerprojecting downward and the latter upward, attached firmly to the shaftand sleeve and formed substantially as indicated in Fig. 2. The sleeveis slightly enlarged at the proper point (indicated at 17) to admit thefinger 7 of the shaft 1, and is also open sufficiently to allow thefinger 7 to play through the same. The valve-rods 9 10 project forwardinto guidesockets formed in the face of the standard 3, and to each ofthe rods is attached a link, respectively 11 and 12, formed, as shown inFig. 3, to embrace the valve-rod at one end, and terminated at the otherby a head having an open rectangular slot 8 opening vertically throughthe same across its length. The links when in position rest respectivelyagainst the sleeve 2, one above and one below, the cam fingersprojecting into the slots respectively, and moving the links forward andbackward. The links are held and guided in the horizontal movement atone side bythe sleeve, against which they rest, and at the other by alateral projection, respectively 13 and 14, of the standard, oneprojecting over and the other under its link. The positions are clearlyindicated in Fig. 2. Each link loosely embraces its valve-rod betweenadjustable collars 15 16-. (Shown in Fig. 3.) These collars are set toallow play of the links upon the rod for a limited part of the movementwithout moving the valve, in order to leave the steamports open duringthe greater part of the stroke, as usually required insteam-pumps. Theymay also be adjusted to give a short stroke should such be desired.

The operation is suffieiently indicated by the construction. Thevalve-rods move in horizontal lines in their guide-sockets and throughthe stnffingboxes of the steam-chests as impelled by the rock-shafts,whose cam projections engage the links in the open slots 8. The linksare guided horizontally between the projections of the bearing-standardand the sleeve 2, being held against lateral displacement by thecam-fingers. It will be observed that the motion of the links andvalverods is always horizontal, and consequently there is no side wearin the stuffing-boxes; also that by adjustment of the collars upon thevalve-rods the play of the valves may be to a great extent regulated.

I am aware of the patents to Blake, No. 200,890, March 5, 1878; Deane,No. 2883M, November 13, 1883, and the German patent, No. 37,146, andwould have it understood that I do not broadly claim any feature ofconstruction therein.

I claim as new and desire to secure by Letters Patent of the UnitedStates 1. In a duplex steam-pump, the combina tion of the concentricrock-shafts having camfingers and each provided with a lever thatconnects With one of the piston-rods, the fixed central bearing for therock-shafts, the slotted links engaged by the cam-fingers, the valverodsmoved by said links, and the horizontal guides for said valve-rods,substantially as described.

2. In a duplex steam-pump, the combination of the concentric rock-shaftshaving camfingers and each actuated by a lever connected With a piston,the valve-rods provided with adjustable collars, the slotted linksengaged by the cam-fingers and embracing the valve-rods between thecollars, the horizontal guides for the valve-rods, and the fixed centralbearing for the rock-shafts, said bearing provided with horizontalguiding projections for the links, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of tWosubscribing Witnesses.

JOHN H. MOGOWAN.

\Vitnesses:

L. M. HOSEA, L. E. HOSEA.

